UngeheuerLich
Legend
The box description on the back tells you that it has "learn-as-you-play components".They aren't defined in the Read this first booklet which tells you to punch tokens and gather them up and stuff.
They do not have a Section which is labeled about Hitpoints, and they do not have it in the Glossary as a term in case you don't know what they are.
They are discussed in combat (finally) after you've put together your character.
Which is quite normal for complex games these days.
The Robinson Crusoe worker placement cooperative adventure game big box has an intro booklet, where you learn the game during play. Learning more and more mechanics while you advance from level to level.
Yeah, at times it was a bit confusing, because we already saw things on our boards that were not explained at that time. But once you accepted that and just ignore everything not yet explained, it worked just fine.
So HP are explained the first time they are used. In the first combat. Seems to make sense. Not learning in advance before it comes up, but just at the right time.
Of course, you could say, that if your players had known that bigger number of HP were better, they had chosen a different character... but I think it is not wrong to assume that your players somehow know that bigger numbers are better.